Gabriel39 opened a new pull request, #45365:
URL: https://github.com/apache/doris/pull/45365
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
Split scan ranges evenly into `parallelExecInstanceNum` instances.
For a fragment contains co-located join,
scan (id = 0) -> join build (id = 2)
|
scan (id = 1) -> join probe (id = 2)
If both of `scan (id = 0)` and `scan (id = 1)` are serial operators, we
will plan local exchanger
after them:
scan (id = 0) -> local exchange -> join build (id = 2)
|
scan (id = 1) -> local exchange -> join probe (id = 2)
And there is another more complicated scenario, for example, `scan (id =
0)` has 10 partitions and
3 buckets which means 3 * 10 tablets and `scan (id = 1)` has 3 buckets and
no partition which means
3 tablets totally. If expected parallelism is 8, we will get a serial scan
(id = 0) and a
non-serial scan (id = 1). For this case, we will plan another plan with
local exchange:
scan (id = 0) -> local exchange -> join build (id = 2)
|
scan (id = 1) -> join probe (id = 2)
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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